Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Carrier power (dBm)

Required number input.

Noise power (dBm)

Required number input.

Compute the carrier-to-noise ratio in decibels as the carrier power minus the noise power, both in dBm. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Carrier-to-noise ratio (dB)

The resulting carrier-to-noise ratio returned as a number.

• Compact electronics formulas omit some combination of tolerances, temperature drift, bandwidth, loading, parasitics, noise spectrum, nonlinearity, clipping, calibration, layout, and device-specific limits. Typical datasheet values are not guaranteed limits.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Dynamic Range dB

  Compute the dynamic range in decibels as the maximum signal level minus the noise floor, both in dBm.

• SFDR dB

  Compute the spurious-free dynamic range in decibels as the carrier level minus the largest spur level, both in dBm.

• PSRR dB

  Compute the power supply rejection ratio in decibels as 20 x log10(delta Vsupply / delta Vout); both deltas must be positive.